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# Index: R

r alias: 2.5. The hist Command (Learning the Korn Shell)
r/R commands: 2.4.2. Entering and Changing Text (Learning the Korn Shell)
-R command-line option: 4.2.2. Read-only Mode (Learning the vi Editor)
r command (sh, ksh): 4.9. Built-in Commands (Bourne and Korn Shells) (Unix in a Nutshell)
-r file attribute operator: 5.1.4.3. File attribute checking (Learning the Korn Shell)
\r metacharacter: 11.7. Extended Regular Expressions (Learning the vi Editor)
-r, -R options (elvis): 10.2. Important Command-Line Arguments (Learning the vi Editor)
-r, -R options (nvi): 9.2. Important Command-Line Arguments (Learning the vi Editor)
-R option (vile): 12.2. Important Command-Line Arguments (Learning the vi Editor)
-r, -R options (vim): 11.2. Important Command-Line Arguments (Learning the vi Editor)
:r (read) command (ex): 5.4. Copying a File into Another File (Learning the vi Editor)
r (read) permission: 3.1.8. Listing Files with ls (Learning Unix)
  3.3.3. Setting Permissions with chmod (Learning Unix)
R (replace character) command: 2.3.3.4. Substituting text (Learning the vi Editor)
  2.4. More Ways to Insert Text (Learning the vi Editor)
rand( ): 9.1.3. Random Number Generation (sed & awk)
rand command (awk): 20.10.7. Alphabetical Summary of Commands (Unix Power Tools)
rand function (awk): 11.10. Alphabetical Summary of Functions and Commands (Unix in a Nutshell)
random numbers: 9.1.3. Random Number Generation (sed & awk)
random numbers in nawk (srand): 20.10.7. Alphabetical Summary of Commands (Unix Power Tools)
RANDOM shell variable: 4.3.2. Built-in Shell Variables (Unix in a Nutshell)
RANDOM variable: 9.1.2.1. EXIT (Learning the Korn Shell)
range of characters (see character classes)
range of lines: 5.2.2. Defining a Range of Lines (Learning the vi Editor)
  5.2.5. Redefining the Current Line Position (Learning the vi Editor)
ranges
  .. (integer-range) operator in zsh: 28.4. Build Strings with { } (Unix Power Tools)
  character ranges (hyphen-separated): 21.11. Hacking on Characters with tr (Unix Power Tools)
  character ranges in regular expressions: 21.11. Hacking on Characters with tr (Unix Power Tools)
    32.8. Regular Expressions: Specifying a Range of Characters with [...] (Unix Power Tools)
  expanding: 9.23.2. Expanding Ranges (Unix Power Tools)
  Perl regular expression syntax for: 32.9. Regular Expressions: Exceptions in a Character Set (Unix Power Tools)
ranlib command: 5.5. Creating and Linking Static Libraries (Mac OS X for Unix Geeks)
rc scripts: 2.1.3. The rc Scripts (Mac OS X for Unix Geeks)
rc shell: 1.6. There Are Many Shells (Unix Power Tools)
rcp command: 1.6.7. Working with Files and Directories (Mac OS X for Unix Geeks)
  2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  1.21. Unix Networking and Communications (Unix Power Tools)
  -r option: 10.12. Copying Directory Trees with cp -r (Unix Power Tools)
rcp program: 6.4.1. scp and rcp (Learning Unix)
$RCS$ keyword (RCS): 19.3.2. Keywords (Unix in a Nutshell)
rcs command: 1.6.1. Standard Unix Development Tools (Mac OS X for Unix Geeks)
rcs command (RCS): 19.5. Alphabetical Summary of Commands (Unix in a Nutshell)
RCS, cvs tool and: 1.6.1. Standard Unix Development Tools (Mac OS X for Unix Geeks)
RCS (Revision Control System): 39.5. RCS Basics (Unix Power Tools)
  archiving files: 39.4. Managing and Sharing Files with RCS and CVS (Unix Power Tools)
  ci (checkin) command: 39.5. RCS Basics (Unix Power Tools)
  co (checkout command)
    -p option, sending file to standard output: 39.5. RCS Basics (Unix Power Tools)
  comparing directory with subdirectory, using pr: 21.15.1. One File per Column: -m (Unix Power Tools)
  Emacs support for: 19.2. Emacs Features: A Laundry List (Unix Power Tools)
  file utility, recognizing archives with: 12.6. Finding File Types (Unix Power Tools)
  listing revision numbers with rcsrevs script: 39.6. List RCS Revision Numbers with rcsrevs (Unix Power Tools)
  merging two or more file versions with rcsmerge and co Ðj: 39.5. RCS Basics (Unix Power Tools)
  searching files with rcsgrep commands: 13.7. Search RCS Files with rcsgrep (Unix Power Tools)
  unlocking files: 39.5. RCS Basics (Unix Power Tools)
RCS subdirectory: 19.2. Basic Operation (Unix in a Nutshell)
RCS utility: 19. The Revision Control System (Unix in a Nutshell)
  commands (by name): 19.5. Alphabetical Summary of Commands (Unix in a Nutshell)
  keyword substitution: 19.3.1. Keyword Substitution (Unix in a Nutshell)
  keywords, list of: 19.3.2. Keywords (Unix in a Nutshell)
  options and environment variables: 19.3.7. Standard Options and Environment Variables (Unix in a Nutshell)
  revision numbering: 19.3.4. Revision Numbering (Unix in a Nutshell)
  revision states: 19.3.6. Specifying States (Unix in a Nutshell)
  SCCS command equivalents: 19.4. Conversion Guide for SCCS Users (Unix in a Nutshell)
  timestamp specifications: 19.3.5. Specifying the Date (Unix in a Nutshell)
rcsclean command (RCS): 19.5. Alphabetical Summary of Commands (Unix in a Nutshell)
rcsdiff command: 11.3. Context diffs (Unix Power Tools)
  39.6. List RCS Revision Numbers with rcsrevs (Unix Power Tools)
rcsdiff command (RCS): 19.2. Basic Operation (Unix in a Nutshell)
  19.5. Alphabetical Summary of Commands (Unix in a Nutshell)
rcsegrep.fast script: 13.7.2. rcsegrep.fast (Unix Power Tools)
rcsfreeze command (RCS): 19.5. Alphabetical Summary of Commands (Unix in a Nutshell)
rcsgrep command: 13.1. Different Versions of grep (Unix Power Tools)
  13.7. Search RCS Files with rcsgrep (Unix Power Tools)
  Ða option: 39.6. List RCS Revision Numbers with rcsrevs (Unix Power Tools)
rcsgrep script: 13.7.1. rcsgrep, rcsegrep, rcsfgrep (Unix Power Tools)
RCSINIT environment variable: 19.3.7. Standard Options and Environment Variables (Unix in a Nutshell)
rcsmerge command (RCS): 19.5. Alphabetical Summary of Commands (Unix in a Nutshell)
RD (Receive Data) light: 5.6.4. Stalled Data Connection? (Unix Power Tools)
rdesktop (RDP client for Unix): 47.9.2. rdesktop (Unix Power Tools)
--re-interval option (gawk): 11.2.3.1. Command line options (sed & awk)
read command: 7.2.3. read (Learning the Korn Shell)
  5.11. Reading and Writing Files (sed & awk)
  28.9.2. A for Loop (Unix Power Tools)
  -p option for: 8.5.4. Coroutines with Two-Way Pipes (Learning the Korn Shell)
    8.5.5. Two-Way Pipes Versus Standard Pipes (Learning the Korn Shell)
  -s option for: 9.2.3.1. Commands (Learning the Korn Shell)
  ex editor: 20.4. Useful ex Commands (Unix Power Tools)
  for user input: 7.2.3.4. Reading user input (Learning the Korn Shell)
  options for: 7.2.3.5. Options to read (Learning the Korn Shell)
    7.2.3.5. Options to read (Learning the Korn Shell)
  reading from the keyboard: 35.18. read: Reading from the Keyboard (Unix Power Tools)
  syntax for: 7.2.3. read (Learning the Korn Shell)
  while loops using: 36.11. Standard Input to a for Loop (Unix Power Tools)
read command (ex): 9.2. Alphabetical Summary of ex Commands (Unix in a Nutshell)
read command (ksh): 4.9. Built-in Commands (Bourne and Korn Shells) (Unix in a Nutshell)
read command (sh): 4.9. Built-in Commands (Bourne and Korn Shells) (Unix in a Nutshell)
read-hook option (vile): 12.10.3. The Procedure Language (Learning the vi Editor)
read-only files: 50.7. Protect Important Files: Make Them Unwritable (Unix Power Tools)
read-only functions: 29.12. Shell Function Specifics (Unix Power Tools)
"[Read only]" message: 1.1.2. Problems Opening Files (Learning the vi Editor)
read-only mode: 4.2.2. Read-only Mode (Learning the vi Editor)
read permission
  changing with chmod: 50.5. Using chmod to Change File Permission (Unix Power Tools)
  for directories: 7.3. Access to Directories (Unix Power Tools)
    50.2. Tutorial on File and Directory Permissions (Unix Power Tools)
  execute permission without: 50.10. A Directory That People Can Access but Can't List (Unix Power Tools)
  finding files by: 9.15. Searching for Files by Permission (Unix Power Tools)
  shell scripts: 50.13. Shell Scripts Must Be Readable and (Usually) Executable (Unix Power Tools)
reading: 10.1. The getline Function (sed & awk)
  from files: 5.11. Reading and Writing Files (sed & awk)
    10.1.1. Reading Input from Files (sed & awk)
  from pipe: 10.1.3. Reading Input from a Pipe (sed & awk)
reading email messages: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
reading files: 3.2. Looking Inside Files with less (Learning Unix)
reading files, access time and: 8.2. The Three Unix File Times (Unix Power Tools)
reading from terminals
  process groups and: 24.3. Managing Processes: Overall Concepts (Unix Power Tools)
reading-tar process: 10.13. Copying Directory Trees with tar and Pipes (Unix Power Tools)
readline command: 5.8. Setting Your Erase, Kill, and Interrupt Characters (Unix Power Tools)
Readline library
  inputrc file: 30.14.5. bash Editing (Unix Power Tools)
  setup filename, choosing: 35.5. Predefined Environment Variables (Unix Power Tools)
README file: 4.2.1. The First Line of Defense (Mac OS X for Unix Geeks)
  4.2.1. The First Line of Defense (Mac OS X for Unix Geeks)
readonly command: 6.5.3. Type and Attribute Options (Learning the Korn Shell)
  4.9. Built-in Commands (Bourne and Korn Shells) (Unix in a Nutshell)
readsource script (example): 13.6. readsource—Format Program Source Files for troff (sed & awk)
RECLEN variable (tawk): 11.3.2.1. Tawk language extensions (sed & awk)
recomment script: 21.4.1. The recomment Script (Unix Power Tools)
recording session: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
records, awk: 2.4.1. Running awk (sed & awk)
  7.5. Records and Fields (sed & awk)
  B.2.1. Records and Fields (sed & awk)
  arrays and: 8.4. Arrays (sed & awk)
  fixed-length (tawk): 11.3.2.1. Tawk language extensions (sed & awk)
  multiline: 7.7.1. Working with Multiline Records (sed & awk)
  NF variable: 7.7. System Variables (sed & awk)
    7.7. System Variables (sed & awk)
  NR variable: 7.7. System Variables (sed & awk)
    7.7. System Variables (sed & awk)
    8.4. Arrays (sed & awk)
    10.1.2. Assigning the Input to a Variable (sed & awk)
  RT variable (gawk): 11.2.3.5. Regular expression record terminators (sed & awk)
  separators for (see delimiters)
recover command (ex): 9.2. Alphabetical Summary of ex Commands (Unix in a Nutshell)
recovering deletions: 2.3.5.4. Problems with deletions (Learning the vi Editor)
  4.3.1. Recovering Deletions (Learning the vi Editor)
recovering files
  cpio tape archive: 38.13. The cpio Tape Archiver (Unix Power Tools)
  Emacs, using: 19.4. Backup and Auto-Save Files (Unix Power Tools)
  vi -r command: 17.19. vi File Recovery Versus Networked Filesystems (Unix Power Tools)
    recovered buffers, cautions about: 17.20. Be Careful with vi -r Recovered Buffers (Unix Power Tools)
recovering the buffer: 4.2.3. Recovering a Buffer (Learning the vi Editor)
recursion, tracing depth of: 29.11.4. Functions Calling Functions: Factorials (Unix Power Tools)
recursive aliases: 29.8. Avoiding C-Shell Alias Loops (Unix Power Tools)
recursive functions: 29.11.4. Functions Calling Functions: Factorials (Unix Power Tools)
recursive permission changing: 50.5. Using chmod to Change File Permission (Unix Power Tools)
recursive searching with grep: 9.11. Custom -exec Tests Applied (Unix Power Tools)
red editor: B.2. Alphabetical Summary of Commands (Unix in a Nutshell)
  B.2. Alphabetical Summary of Commands (Unix in a Nutshell)
  (see also ed editor)
Red Hat: 6. Creating and Installing Packages (Mac OS X for Unix Geeks)
Red Hat Linux (see Linux)
redirect command: 4.9. Built-in Commands (Bourne and Korn Shells) (Unix in a Nutshell)
redirect operator (>>): 17.12. Appending to an Existing File (Unix Power Tools)
redirecting input and output: 43.1. Using Standard Input and Output (Unix Power Tools)
  C shell: 43.5. Redirection in C Shell: Capture Errors, Too? (Unix Power Tools)
  cat command: 43.2. One Argument with a cat Isn't Enough (Unix Power Tools)
  commands combined with grouping (( )) operator: 43.7. The ( ) Subshell Operators (Unix Power Tools)
  cron system output: 25.2. Periodic Program Execution: The cron Facility (Unix Power Tools)
  to /dev/null: 43.12. What Can You Do with an Empty File? (Unix Power Tools)
  FIFOs, using: 43.11. Named Pipes: FIFOs (Unix Power Tools)
  line numbers in redirected loops: 37.1.5. Line Numbers Reset Inside Redirected Loops (Unix Power Tools)
  to multiple processes: 43.10. Redirecting Output to More Than One Place (Unix Power Tools)
  noclobber, using: 43.6. Safe I/O Redirection with noclobber (Unix Power Tools)
  openstandard I/O files without: 36.15. Overview: Open Files and File Descriptors (Unix Power Tools)
  pagers, piping to: 43.4. Problems Piping to a Pager (Unix Power Tools)
  of programs: 36.15. Overview: Open Files and File Descriptors (Unix Power Tools)
  shell capabilities: 36.15. Overview: Open Files and File Descriptors (Unix Power Tools)
  shell output and errors into temporary file: 37.1.1. Use -xv (Unix Power Tools)
  standard error (only), piping: 43.3. Send (Only) Standard Error Down a Pipe (Unix Power Tools)
  standard input and standard output, using: 43.1. Using Standard Input and Output (Unix Power Tools)
  standard output and standard error: 36.16. n>&m: Swap Standard Output and Standard Error (Unix Power Tools)
    Bourne shells: 27.11. Is It "2>&1 file" or "> file 2>&1"? Why? (Unix Power Tools)
  standard output, shell processing of: 27.4. Command Evaluation and Accidentally Overwriting Files (Unix Power Tools)
  tee program: 43.8. Send Output Two or More Places (Unix Power Tools)
redirecting input/output: 5.1. Standard Input and Standard Output (Learning Unix)
redirection: 2.3.2.1. Saving output (sed & awk)
  4.3. Testing and Saving Output (sed & awk)
  10.5. Directing Output to Files and Pipes (sed & awk)
redirections
  csh forms for: 5.2.5. Redirection Forms (Unix in a Nutshell)
  sh and ksh forms for: 4.2.5. Redirection Forms (Unix in a Nutshell)
redo command: 2.4.3. Deletion Commands (Learning the Korn Shell)
redo operator (Perl): 41.6. Perl Boot Camp, Part 3: Branching and Looping (Unix Power Tools)
redrawing screen: 3.1.3. Redrawing the Screen (Learning the vi Editor)
  dumb terminals and: 2.3.1. Inserting New Text (Learning the vi Editor)
refer command: 17.4.3. Alphabetical Summary of Commands (Unix in a Nutshell)
refer processor (nroff/troff): 17.4. refer (Unix in a Nutshell)
reference appendix: B. Reference Information (Learning the Korn Shell)
references: 0.. Other Sources of Information About sed and awk (sed & awk)
references (Perl): 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy (Unix Power Tools)
  41.5.4. References (Unix Power Tools)
  dereferencing: 41.5.4. References (Unix Power Tools)
referencing arrays: 4.3.4. Arrays (Unix in a Nutshell)
referencing fields: 2.4.1. Running awk (sed & awk)
  7.5.1. Referencing and Separating Fields (sed & awk)
reformatting text from one window before pasting it into another: 5.21. Tips for Copy and Paste Between Windows (Unix Power Tools)
reformatting text (vile): 12.10.4. Miscellaneous Small Features (Learning the vi Editor)
regcmp command: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
regexp operators: 4.5.2. Patterns and Regular Expressions (Learning the Korn Shell)
regions, emacs commands for: 7.2.4. Paragraphs and Regions (Unix in a Nutshell)
registry settings for clear text SMB passwords: 47.3. Securing Samba (Unix Power Tools)
regular expression: 5.2.1. grep (Learning Unix)
regular expressions: 4.5.2. Patterns and Regular Expressions (Learning the Korn Shell)
  1.4. Four Hurdles to Mastering sed and awk (sed & awk)
  1.4. Four Hurdles to Mastering sed and awk (sed & awk)
  3. Understanding Regular Expression Syntax (sed & awk)
  B.2.3. Patterns (sed & awk)
  B.2.4. Regular Expressions (sed & awk)
  13.2. Searching for Text with grep (Unix Power Tools)
  17.8. Using Search Patterns and Global Commands (Unix Power Tools)
  32.1. That's an Expression (Unix Power Tools)
  6.3. Pattern-Matching Rules (Learning the vi Editor)
  8.4. Extended Regular Expressions (Learning the vi Editor)
  agrep command: 13.6. Approximate grep: agrep (Unix Power Tools)
    13.6. Approximate grep: agrep (Unix Power Tools)
  awk utility: 20.10.2.1. Patterns (Unix Power Tools)
  compiling: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  as constants: 7.8. Relational and Boolean Operators (sed & awk)
  delimiters for: 2.1. Awk, by Sed and Grep, out of Ed (sed & awk)
    5.3. Substitution (sed & awk)
  dynamic, faking: 11.1.5. Faking Dynamic Regular Expressions (sed & awk)
  ed and: 2.1. Awk, by Sed and Grep, out of Ed (sed & awk)
  egrep command: 9.22. lookfor: Which File Has That Word? (Unix Power Tools)
    13.4. Extended Searching for Text with egrep (Unix Power Tools)
  elvis editor: 10.7. Extended Regular Expressions (Learning the vi Editor)
  examples of: 3.3. I Never Metacharacter I Didn't Like (sed & awk)
    32.19. I Never Meta Character I Didn't Like (Unix Power Tools)
  expr command
    matching parts of strings: 36.23.1. Matching with expr (Unix Power Tools)
    testing character strings: 36.22. Testing Characters in a String with expr (Unix Power Tools)
  expressions, understanding: 32.3. Understanding Expressions (Unix Power Tools)
  extended: 32.15. Extended Regular Expressions (Unix Power Tools)
    alternation mechanism: 32.15. Extended Regular Expressions (Unix Power Tools)
  filename-matching patterns vs.: 32.2. Don't Confuse Regular Expressions with Wildcards (Unix Power Tools)
  finding lines that don't match a pattern: 13.3. Finding Text That Doesn't Match (Unix Power Tools)
  gawk extensions to: 11.2.3.4. Extended regular expressions (sed & awk)
  globally substituting for each match: 20.10.7. Alphabetical Summary of Commands (Unix Power Tools)
  in command-line processing: 7.3.2. Substitution Order (Learning the Korn Shell)
  interpreting: 32.3. Understanding Expressions (Unix Power Tools)
  lexical analysis program: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  limiting extent of match: 32.18. Limiting the Extent of a Match (Unix Power Tools)
  matching a character with a character set: 32.6. Regular Expressions: Matching a Character with a Character Set (Unix Power Tools)
  matching specific number of sets with \{ \}: 32.11. Regular Expressions: Matching a Specific Number of Sets with \ { and \ } (Unix Power Tools)
  matching words with \< \\\>: 32.12. Regular Expressions: Matching Words with \ < and \ > (Unix Power Tools)
  metacharacters: 27.17. "Special" Characters and Operators (Unix Power Tools)
    32.3. Understanding Expressions (Unix Power Tools)
    32.4. Using Metacharacters in Regular Expressions (Unix Power Tools)
    for different Unix programs: 32.20. Valid Metacharacters for Different Unix Programs (Unix Power Tools)
    in replacement strings: 6.3.3. Metacharacters Used in Replacement Strings (Learning the vi Editor)
    in search patterns: 6.3.1. Metacharacters Used in Search Patterns (Learning the vi Editor)
    substitution tricks: 6.3.4. More Substitution Tricks (Learning the vi Editor)
  metacharacters for (see netacharacters)
  nvi editor: 9.7. Extended Regular Expressions (Learning the vi Editor)
  operators for: 4.5.2.1. Regular expression basics (Learning the Korn Shell)
  pattern context: 32.16. Getting Regular Expressions Right (Unix Power Tools)
  pattern-matching examples: 6.4. Pattern-Matching Examples (Learning the vi Editor)
  pattern matching, quick reference: 32.21. Pattern Matching Quick Reference with Examples (Unix Power Tools)
    replacement patterns: 32.21. Pattern Matching Quick Reference with Examples (Unix Power Tools)
    search and replace commands: 32.21.2. Examples of Searching and Replacing (Unix Power Tools)
    search patterns: 32.21. Pattern Matching Quick Reference with Examples (Unix Power Tools)
      32.21.1. Examples of Searching (Unix Power Tools)
  pattern matching with: 4.5.2.4. Pattern matching with regular expressions (Learning the Korn Shell)
  Perl: 41.7. Perl Boot Camp, Part 4: Pattern Matching (Unix Power Tools)
    metacharacters in: 41.7. Perl Boot Camp, Part 4: Pattern Matching (Unix Power Tools)
  POSIX bracket expressions: 6.3.2. POSIX Bracket Expressions (Learning the vi Editor)
  POSIX standard for: 3.2.4.3. POSIX character class additions (sed & awk)
  potential problem areas: 32.14. Regular Expressions: Potential Problems (Unix Power Tools)
  range of characters, specifying with [ ]: 32.8. Regular Expressions: Specifying a Range of Characters with [...] (Unix Power Tools)
  repeated patterns, matching with \(\): 32.13. Regular Expressions: Remembering Patterns with \ (, \ ), and \1 (Unix Power Tools)
  repeating character sets with *: 32.10. Regular Expressions: Repeating Character Sets with * (Unix Power Tools)
  retrieving only matched text with xgrep script: 32.17. Just What Does a Regular Expression Match? (Unix Power Tools)
  RS variable as: 11.2.1.6. Regular expression record separators (gawk and mawk) (sed & awk)
    11.3.2.1. Tawk language extensions (sed & awk)
  searching file contents: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
    2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  searching files for: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  for sed command addresses: 10.3.1. Pattern Addressing (Unix in a Nutshell)
  sed editor: 13.11. Narrowing a Search Quickly (Unix Power Tools)
    addresses: 34.5. sed Addressing Basics (Unix Power Tools)
      34.5. sed Addressing Basics (Unix Power Tools)
    delimiting: 34.8. Delimiting a Regular Expression (Unix Power Tools)
    searching for patterns split across lines: 34.18. Searching for Patterns Split Across Lines (Unix Power Tools)
  sequence of characters, describing: 32.3. Understanding Expressions (Unix Power Tools)
  showmatch script, testing with: 32.17. Just What Does a Regular Expression Match? (Unix Power Tools)
  simple vs. extended: 32.4. Using Metacharacters in Regular Expressions (Unix Power Tools)
  substituting for matches in nawk: 20.10.7. Alphabetical Summary of Commands (Unix Power Tools)
  syntax for: 4.5.2.1. Regular expression basics (Learning the Korn Shell)
  tar archive files, matching filenames of: 38.10.1. Without GNU tar (Unix Power Tools)
  tawk and: 11.3.2.1. Tawk language extensions (sed & awk)
  union of: 3.2. A Line-Up of Characters (sed & awk)
    3.2.9. Alternative Operations (sed & awk)
  vile editor: 12.7. Extended Regular Expressions (Learning the vi Editor)
  vim editor: 11.7. Extended Regular Expressions (Learning the vi Editor)
  vs. awk and egrep: 4.5.2.1. Regular expression basics (Learning the Korn Shell)
  wildcards and: 4.5.2. Patterns and Regular Expressions (Learning the Korn Shell)
    4.5.2.3. Korn shell versus awk/egrep regular expressions (Learning the Korn Shell)
  wildcards vs.: 32.2. Don't Confuse Regular Expressions with Wildcards (Unix Power Tools)
  writing: 3.2.3. Writing Regular Expressions (sed & awk)
rehash command: 5.8. Built-in C Shell Commands (Unix in a Nutshell)
  7.4. A bin Directory for Your Programs and Scripts (Unix Power Tools)
  27.6. Controlling Shell Command Searches (Unix Power Tools)
  resetting command search table: 35.1. Writing a Simple Shell Program (Unix Power Tools)
relational expressions: B.2.3. Patterns (sed & awk)
relational operators: 7.8. Relational and Boolean Operators (sed & awk)
  36.21.1. Syntax (Unix Power Tools)
  41.5.1. Scalars (Unix Power Tools)
  if command, awk: 20.10.7. Alphabetical Summary of Commands (Unix Power Tools)
relative line addressing (ex): 5.2.3. Line Addressing Symbols (Learning the vi Editor)
relative pathnames: 1.6.1.1. The working directory (Learning the Korn Shell)
  3.1.5. Relative Pathnames (Learning Unix)
  1.16. Making Pathnames (Unix Power Tools)
  31.2. Using Relative and Absolute Pathnames (Unix Power Tools)
  1.1.1. Opening a File (Learning the vi Editor)
  creating: 31.2. Using Relative and Absolute Pathnames (Unix Power Tools)
  current directory and: 31.3. What Good Is a Current Directory? (Unix Power Tools)
  links, avoiding invalidation of: 10.6. Stale Symbolic Links (Unix Power Tools)
  in shell setup files: 3.7. Use Absolute Pathnames in Shell Setup Files (Unix Power Tools)
  symbolic links to: 10.8. Showing the Actual Filenames for Symbolic Links (Unix Power Tools)
relogin command: B.2. Alphabetical Summary of Commands (Unix in a Nutshell)
remainder, modulus (%) operator: 36.21.1. Syntax (Unix Power Tools)
Remember position (Sawfish window menu): 2.5.5. The Window Menu (Learning Unix)
remote access
  conrolling (see ssh)
  disallowing for security: 48.11. Disallow rlogin and rsh (Unix Power Tools)
  rsh (see rsh)
remote clients, starting for X window systems: 6.10. Starting Remote X Clients (Unix Power Tools)
remote communications (calling out): B.2. Alphabetical Summary of Commands (Unix in a Nutshell)
Remote Desktop Protocol (RDP): 47.9. Citrix: Making Windows Multiuser (Unix Power Tools)
  client for Unix (rdesktop): 47.9.2. rdesktop (Unix Power Tools)
remote directories, hung terminals and: 5.6. Checklist: Terminal Hangs When I Log In (Unix Power Tools)
remote file transfer: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
remote files: 4.4.6. Files on Other Operating Systems (Learning Unix)
  copying: 6.4. Transferring Files (Learning Unix)
  Emacs, opening with: 19.2. Emacs Features: A Laundry List (Unix Power Tools)
  shortcut for copying: 28.4. Build Strings with { } (Unix Power Tools)
remote host, connecting to: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
remote logins: 6.1. Remote Logins (Learning Unix)
  status line updates: 4.8. Session Info in Window Title or Status Line (Unix Power Tools)
  stopping sessions: 23.13. Stopping Remote Login Sessions (Unix Power Tools)
remote object registry: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
remote restoration of backup files: 38.6.2. Remote Restoring (Unix Power Tools)
remote shell (see rsh)
remote shells: 3.8. Setup Files Aren't Read When You Want? (Unix Power Tools)
  (see also rsh; ssh)
  setup files for: 3.8. Setup Files Aren't Read When You Want? (Unix Power Tools)
remote systems
  copying files between: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
    2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
    B.2. Alphabetical Summary of Commands (Unix in a Nutshell)
remote tape drive, tar backups to: 38.7. Using tar to a Remote Tape Drive (Unix Power Tools)
  38.8. Using GNU tar with a Remote Tape Drive (Unix Power Tools)
removable media
  checking if inserted: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  ejecting: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
remove option (xrdb): 6.8. Setting Resources with xrdb (Unix Power Tools)
removing (see deleting)
  command-line arguments: 35.20.2. With a Loop (Unix Power Tools)
  software packages, dependency conflicts caused by: 40.5.3. Choosing Packages for Installation or Removal (Unix Power Tools)
removing files: 14.1. The Cycle of Creation and Destruction (Unix Power Tools)
  confirmation before deletion: 14.5. Answer "Yes" or "No" Forever with yes (Unix Power Tools)
  deleting directories: 14.16. Problems Deleting Directories (Unix Power Tools)
  deleting files with odd names: 14.11. Deleting Files with Odd Names (Unix Power Tools)
    eight-bit filenames: 14.14. Using unlink to Remove a File with a Strange Name (Unix Power Tools)
    filenames starting with - (dash): 14.13. Handling a Filename Starting with a Dash (-) (Unix Power Tools)
    i-numbers, using: 14.15. Removing a Strange File by its i-number (Unix Power Tools)
  directory sticky bit permission and: 50.4. Protecting Files with the Sticky Bit (Unix Power Tools)
  emptying files instead of: 15.2. Instead of Removing a File, Empty It (Unix Power Tools)
  excluding some files from: 14.18. Removing Every File but One (Unix Power Tools)
  find command and: 14.19. Using find to Clear Out Unneeded Files (Unix Power Tools)
  interactively, with file-deletion script or alias: 14.7. A Faster Way to Remove Files Interactively (Unix Power Tools)
  rm command
    -f option (no confirmation): 14.10. Deletion with Prejudice: rm -f (Unix Power Tools)
    dangers of: 14.3. rm and Its Dangers (Unix Power Tools)
    safety techniques for: 14.4. Tricks for Making rm Safer (Unix Power Tools)
  safe delete program: 14.9. Safe Delete: Pros and Cons (Unix Power Tools)
  safer file deletion in some directories: 14.8. Safer File Deletion in Some Directories (Unix Power Tools)
  selective deletion of: 14.6. Remove Some, Leave Some (Unix Power Tools)
  stale files, deleting: 14.17. Deleting Stale Files (Unix Power Tools)
removing files and directories: 4.4.5. Removing Files and Directories (Learning Unix)
remsh command (see rsh)
rename function: 41.8. Perl Boot Camp, Part 5: Perl Knows Unix (Unix Power Tools)
renaming, directories and files: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
renaming buffer (ex): 5.3.1. Renaming the Buffer (Learning the vi Editor)
renaming files
  directory sticky bit permission and: 50.4. Protecting Files with the Sticky Bit (Unix Power Tools)
  groups of: 10.1. What's So Complicated About Copying Files (Unix Power Tools)
    10.9. Renaming, Copying, or Comparing a Set of Files (Unix Power Tools)
  interactively: 10.10. Renaming a List of Files Interactively (Unix Power Tools)
  mv command, using: 8.11. Can't Access a File? Look for Spaces in the Name (Unix Power Tools)
  with nonprinting characters in names: 8.12. Showing Nonprintable Characters in Filenames (Unix Power Tools)
  ownership and: 50.3. Who Will Own a New File? (Unix Power Tools)
  write access and: 50.9. A Loophole: Modifying Files Without Write Access (Unix Power Tools)
Rendezvous protocol: 3.3. Configuring Directory Services (Mac OS X for Unix Geeks)
renice command: 23.7. System Overloaded? Try Stopping Some Jobs (Unix Power Tools)
  26.5. Know When to Be "nice" to Other Users...and When Not To (Unix Power Tools)
  26.7. Changing a Running Job's Niceness (Unix Power Tools)
rep command, vis command vs.: 28.11. Repeating a Time-Varying Command (Unix Power Tools)
repeat command: 5.8. Built-in C Shell Commands (Unix in a Nutshell)
  28.8. Repeating Commands (Unix Power Tools)
  . (dot), in vi: 17.7. Get Back What You Deleted with Numbered Buffers (Unix Power Tools)
  clearing directory stack with popd: 31.7. The Shells' pushd and popd Commands (Unix Power Tools)
repeat counts: 2.3.6. Miscellaneous Commands (Learning the Korn Shell)
  2.4.1. Simple Control Mode Commands (Learning the Korn Shell)
repeating commands: 28.8. Repeating Commands (Unix Power Tools)
  30.1. The Lessons of History (Unix Power Tools)
  2.3.8.1. Repeat (Learning the vi Editor)
  at set intervals: 28.11. Repeating a Time-Varying Command (Unix Power Tools)
  copy and paste, using: 28.10. Repeating a Command with Copy-and-Paste (Unix Power Tools)
  cycle of commands: 30.9. Repeating a Cycle of Commands (Unix Power Tools)
  :g command for (example): 6.5.3. Using :g to Repeat a Command (Learning the vi Editor)
  global substitutions: 6.3.4. More Substitution Tricks (Learning the vi Editor)
  pattern searches: 3.3.1. Repeating Searches (Learning the vi Editor)
    3.3.2. Current Line Searches (Learning the vi Editor)
  searching numbered buffers: 4.3.1. Recovering Deletions (Learning the vi Editor)
  with history substitution: 30.8. History Substitutions (Unix Power Tools)
  with variations: 28.9.1. A foreach Loop (Unix Power Tools)
    for loop, using: 28.9.2. A for Loop (Unix Power Tools)
    foreach loop, using: 28.9.1. A foreach Loop (Unix Power Tools)
replacement metacharacters: 5.3.1. Replacement Metacharacters (sed & awk)
  numbered saves: 5.3.1. Replacement Metacharacters (sed & awk)
replacement patterns
  sed editor, delimiting: 34.8. Delimiting a Regular Expression (Unix Power Tools)
  special characters in: 32.21. Pattern Matching Quick Reference with Examples (Unix Power Tools)
  valid regular expression metacharacters for: 32.20. Valid Metacharacters for Different Unix Programs (Unix Power Tools)
replacements: 20.4. Useful ex Commands (Unix Power Tools)
  20.4. Useful ex Commands (Unix Power Tools)
  (see also substitution commands)
  confirming in vi editor: 17.9. Confirming Substitutions in vi (Unix Power Tools)
  global, with vi editor: 17.8.1. Global Searches (Unix Power Tools)
  patterns, matching for: 17.14. Useful Global Commands (with Pattern Matches) (Unix Power Tools)
  sed editor
    newlines in: 34.9. Newlines in a sed Replacement (Unix Power Tools)
    referencing portions of search string in: 34.11. Referencing Portions of a Search String (Unix Power Tools)
    referencing the search string in: 34.10. Referencing the Search String in a Replacement (Unix Power Tools)
    specifying one match among many possible matches: 34.12. Search and Replacement: One Match Among Many (Unix Power Tools)
replacing files in archives: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
replacing text: 1.2. A Stream Editor (sed & awk)
  3.2.12.1. The extent of the match (sed & awk)
  2.3. Simple Edits (Learning the vi Editor)
  2.3.3. Changing Text (Learning the vi Editor)
  by characters: 2.3.3.3. Characters (Learning the vi Editor)
  globally: 6. Global Replacement (Learning the vi Editor)
    confirming substitutions: 6.1. Confirming Substitutions (Learning the vi Editor)
    context sensitivity: 6.2. Context-Sensitive Replacement (Learning the vi Editor)
    replacement-string metacharacters: 6.3.3. Metacharacters Used in Replacement Strings (Learning the vi Editor)
    substitution tricks: 6.3.4. More Substitution Tricks (Learning the vi Editor)
  by lines: 2.3.3.2. Lines (Learning the vi Editor)
    2.3.3.4. Substituting text (Learning the vi Editor)
  searching and: 3.3.1.1. Changing through searching (Learning the vi Editor)
  by words: 2.3.3.1. Words (Learning the vi Editor)
replacing text, metacharacters for: 6.4.5. Examples of Searching and Replacing (Unix in a Nutshell)
REPLY shell variable: 4.3.2. Built-in Shell Variables (Unix in a Nutshell)
REPLY variable
  in read statement: 7.2.3. read (Learning the Korn Shell)
  in select statement: 5.4. select (Learning the Korn Shell)
    5.4. select (Learning the Korn Shell)
    6.4.1. Indexed Arrays (Learning the Korn Shell)
reports
  on active processes: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  on system status: B.2. Alphabetical Summary of Commands (Unix in a Nutshell)
repositioning screen: 3.1.2. Repositioning the Screen with z (Learning the vi Editor)
repositories, CVS archives: 39.7. CVS Basics (Unix Power Tools)
  modifications, commiting and pushing into: 39.7. CVS Basics (Unix Power Tools)
  setting up: 39.8. More CVS (Unix Power Tools)
reprint character (CTRL-r): 28.2. Reprinting Your Command Line with CTRL-r (Unix Power Tools)
requests, nroff/troff: 12.4. Default Operation of Requests (Unix in a Nutshell)
requote shell script: 5.21. Tips for Copy and Paste Between Windows (Unix Power Tools)
  fmt width option: 5.21. Tips for Copy and Paste Between Windows (Unix Power Tools)
reset command: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  (see also tset command)
resize command: 3.16. Terminal Setup: Testing Window Size (Unix Power Tools)
  c or u options to force use of C- or Bourne-shell syntax: 5.5. Querying Your xterm Size: resize (Unix Power Tools)
  xterm windows: 5.5. Querying Your xterm Size: resize (Unix Power Tools)
:resize command (nvi): 9.5. Multiwindow Editing (Learning the vi Editor)
:resize (:res) command (vim): 11.5. Multiwindow Editing (Learning the vi Editor)
:resize-window command (vile): 12.5. Multiwindow Editing (Learning the vi Editor)
resizing windows: 2.5.3. Resizing Windows (Learning Unix)
ResMerger tool: 1.6.2. Apple's Command-line Developer Tools (Mac OS X for Unix Geeks)
resource files, tools for: 1.6.2. Apple's Command-line Developer Tools (Mac OS X for Unix Geeks)
resource forks, commands/tools for: 1.6.2. Apple's Command-line Developer Tools (Mac OS X for Unix Geeks)
  1.6.2. Apple's Command-line Developer Tools (Mac OS X for Unix Geeks)
resource strings, BuildStrings tool for: 1.6.2. Apple's Command-line Developer Tools (Mac OS X for Unix Geeks)
RESOURCE_MANAGER property: 6.8. Setting Resources with xrdb (Unix Power Tools)
resources
  overloaded: 23.7. System Overloaded? Try Stopping Some Jobs (Unix Power Tools)
  removing definitions: 6.8. Setting Resources with xrdb (Unix Power Tools)
  setting for X Window System: 6.3. X Resource Syntax (Unix Power Tools)
    6.5. Setting X Resources: Overview (Unix Power Tools)
    -name, effect on resources: 6.7. How -name Affects Resources (Unix Power Tools)
    appres (application resource) utility: 6.9. Listing the Current Resources for a Client: appres (Unix Power Tools)
    event translations, overview: 6.4. X Event Translations (Unix Power Tools)
    querying resource database: 6.8. Setting Resources with xrdb (Unix Power Tools)
    resource database manager: 6.3. X Resource Syntax (Unix Power Tools)
    resources file (example): 6.5. Setting X Resources: Overview (Unix Power Tools)
    xrdb utility, using: 6.8. Setting Resources with xrdb (Unix Power Tools)
    xrm command-line option: 6.6. Setting Resources with the -xrm Option (Unix Power Tools)
resources, controlling with ulimit command: 10.2.2. ulimit (Learning the Korn Shell)
resources for further reading: 0.4. Where to Go for More Information (Mac OS X for Unix Geeks)
  assembler and PowerPC machine language: 4.3. Architectural Issues (Mac OS X for Unix Geeks)
  Developer Tools: 4. Compiling Source Code (Mac OS X for Unix Geeks)
  Emacs editor: 2. Command-Line Editing (Learning the Korn Shell)
  flat file formats: 3.11. Flat Files and Their NetInfo Counterparts (Mac OS X for Unix Geeks)
  kernel extension tutorials: 8.2.2. Kernel Module Utilities (Mac OS X for Unix Geeks)
  Mac OS X: 0.1. Audience for This Book (Mac OS X for Unix Geeks)
  NetInfo utilities: 3.6. NetInfo Command Reference (Mac OS X for Unix Geeks)
  PAM API: 3.2.1. Working with Passwords (Mac OS X for Unix Geeks)
  prebinding: 5.6. Prebinding (Mac OS X for Unix Geeks)
  precompiled header files: 5.1.1. Precompiled Header Files (Mac OS X for Unix Geeks)
  regular expressions: 4.5.2. Patterns and Regular Expressions (Learning the Korn Shell)
  Unix security: 10.4.4. Setuid and Privileged Mode (Learning the Korn Shell)
  vi editor: 2. Command-Line Editing (Learning the Korn Shell)
restart command (lpc): 45.3. Printer Control with lpc (Unix Power Tools)
:restore-window command (vile): 12.5. Multiwindow Editing (Learning the vi Editor)
restoring files: 38.6. Restoring Files from Tape with tar (Unix Power Tools)
  (see also backups; tar utility)
  RCS, using: 39.5. RCS Basics (Unix Power Tools)
  from remote tape drives: 38.7. Using tar to a Remote Tape Drive (Unix Power Tools)
  from tape with tar: 38.6. Restoring Files from Tape with tar (Unix Power Tools)
restricted command access (rsh) shell: 27.1. What the Shell Does (Unix Power Tools)
restricted shell: 10.4.2. Restricted Shell (Learning the Korn Shell)
  6.10.2. Starting a Remote Client with rsh and ssh (Unix Power Tools)
restricted shells: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  4.8. Restricted Shells (Unix in a Nutshell)
retrieving data from files: 7.11. Information Retrieval (sed & awk)
RETURN characters (in .exrc file for vi editor): 17.30. Setting Up vi with the .exrc File (Unix Power Tools)
return command: 4.9. Built-in Commands (Bourne and Korn Shells) (Unix in a Nutshell)
  awk utility: 20.10.7. Alphabetical Summary of Commands (Unix Power Tools)
  shell function, use in: 29.11.3. Setting Current Shell Environment: The work Function (Unix Power Tools)
return command (awk): 11.10. Alphabetical Summary of Functions and Commands (Unix in a Nutshell)
RETURN command, (less): 3.2. Looking Inside Files with less (Learning Unix)
RETURN key
  moving with: 2.2.1. Single Movements (Learning the vi Editor)
    3.1.5. Movement by Line (Learning the vi Editor)
  newlines in insert mode: 2.2.3. Movement Within a Line (Learning the vi Editor)
return statement: 5.1.1.1. Return (Learning the Korn Shell)
  9.3. Writing Your Own Functions (sed & awk)
  9.3.1. Writing a Sort Function (sed & awk)
:reverse-incremental-search command (vile): 12.8.5. Incremental Searching (Learning the vi Editor)
reverse linefeeds, displaying: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
reverse order, command history listed in: 30.7. History by Number (Unix Power Tools)
Reverse Polish Notation (RPN): 8.5.4. Coroutines with Two-Way Pipes (Learning the Korn Shell)
  8.6.2. Subshells (Learning the Korn Shell)
reversing patch: 20.9. patch: Generalized Updating of Files That Differ (Unix Power Tools)
reversing sort order: 22.6.6. Reverse Sort (Unix Power Tools)
$Revision: 1.3 $ keyword (RCS): 19.3.2. Keywords (Unix in a Nutshell)
revision control (see CVS RCS)
  RCS utility: 19. The Revision Control System (Unix in a Nutshell)
    19.4. Conversion Guide for SCCS Users (Unix in a Nutshell)
    commands (by name): 19.5. Alphabetical Summary of Commands (Unix in a Nutshell)
    keyword substitution: 19.3.1. Keyword Substitution (Unix in a Nutshell)
    keywords, list of: 19.3.2. Keywords (Unix in a Nutshell)
    options and environment variables: 19.3.7. Standard Options and Environment Variables (Unix in a Nutshell)
    revision numbering: 19.3.4. Revision Numbering (Unix in a Nutshell)
  SCCS utility: 18. The Source Code Control System (Unix in a Nutshell)
    19.4. Conversion Guide for SCCS Users (Unix in a Nutshell)
    commands (by category): 18.2. Overview of Commands (Unix in a Nutshell)
    commands (by name): 18.6. Alphabetical Summary of SCCS Commands (Unix in a Nutshell)
    data keywords: 18.5. Data Keywords (Unix in a Nutshell)
    identification keywords: 18.4. Identification Keywords (Unix in a Nutshell)
    pseudo-commands: 18.7. sccs and Pseudo-Commands (Unix in a Nutshell)
revision control programs, file versions and: 1.11. Filenames (Unix Power Tools)
Revision Control System (see RCS)
revision control systems: 10.7.1. Make a Copy (sed & awk)
revision numbers (RCS): 19.3.4. Revision Numbering (Unix in a Nutshell)
revnum shell variable: 39.6. List RCS Revision Numbers with rcsrevs (Unix Power Tools)
:rew, :rewind commands (ex): 5.5.2. Using the Argument List (Learning the vi Editor)
rewind command (ex): 9.2. Alphabetical Summary of ex Commands (Unix in a Nutshell)
Rez tool: 1.6.2. Apple's Command-line Developer Tools (Mac OS X for Unix Geeks)
RezWack tool: 1.6.2. Apple's Command-line Developer Tools (Mac OS X for Unix Geeks)
rftp script: 28.18.2. Automating /bin/passwd (Unix Power Tools)
.rhosts file: 5.22. Running a Single Command with xterm -e (Unix Power Tools)
  6.10.2. Starting a Remote Client with rsh and ssh (Unix Power Tools)
  38.7. Using tar to a Remote Tape Drive (Unix Power Tools)
Rich Site Summary files, collecting: 25.1. Building Software Robots the Easy Way (Unix Power Tools)
right angle bracket (>) 7.1. I/O Redirectors (Learning the Korn Shell)
  ex command: 9.2. Alphabetical Summary of ex Commands (Unix in a Nutshell)
  greater than operator: 4.4.1. Operators (Unix in a Nutshell)
    5.4.1.4. Comparison operators (Unix in a Nutshell)
    11.5. Operators (Unix in a Nutshell)
  redirection operator: 4.2.5.1. Simple redirection (Unix in a Nutshell)
  >& (file descriptor): 4.2.5.2. Redirection using file descriptors (Unix in a Nutshell)
  >> redirection operator: 4.2.5.1. Simple redirection (Unix in a Nutshell)
  >>= assignment operator: 4.4.1. Operators (Unix in a Nutshell)
  >= greater than or equal operator: 4.4.1. Operators (Unix in a Nutshell)
    5.4.1.4. Comparison operators (Unix in a Nutshell)
    11.5. Operators (Unix in a Nutshell)
  >> bitwise shift operator: 4.4.1. Operators (Unix in a Nutshell)
    5.4.1.3. Bitwise and logical operators (Unix in a Nutshell)
right margin, setting: 2.2.3. Movement Within a Line (Learning the vi Editor)
right-side prompts: 4.11. Right-Side Prompts (Unix Power Tools)
right/left scrolling: 8.6.5. Left-Right Scrolling (Learning the vi Editor)
  elvis editor: 10.8.5. Left-Right Scrolling (Learning the vi Editor)
  nvi editor: 9.8.6. Left-Right Scrolling (Learning the vi Editor)
  vile editor: 12.8.6. Left-Right Scrolling (Learning the vi Editor)
  vim editor: 11.8.6. Left-Right Scrolling (Learning the vi Editor)
rksh command: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  4.8. Restricted Shells (Unix in a Nutshell)
rksh shell: 10.4.2. Restricted Shell (Learning the Korn Shell)
rlog command (RCS): 19.5. Alphabetical Summary of Commands (Unix in a Nutshell)
rlogin command: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
rlogin program: 6.1. Remote Logins (Learning Unix)
  6.1. Remote Logins (Learning Unix)
rlogin utility: 6.10.1. Starting Remote X Clients from Interactive Logins (Unix Power Tools)
  disabling for security reasons: 48.11. Disallow rlogin and rsh (Unix Power Tools)
  enabling on Mac OS X: 51.1. Enabling Remote Access on Mac OS X (Unix Power Tools)
  logging in to host again from same terminal: 3.6. Tip for Changing Account Setup: Keep a Shell Ready (Unix Power Tools)
  network ports for: 3.13. Terminal Setup: Testing Port (Unix Power Tools)
  stalled connection with: 5.6.4. Stalled Data Connection? (Unix Power Tools)
rm command: 8.4.2. Process ID Variables and Temporary Files (Learning the Korn Shell)
  2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  14.3. rm and Its Dangers (Unix Power Tools)
  -f option: 14.10. Deletion with Prejudice: rm -f (Unix Power Tools)
    35.17. Trapping Exits Caused by Interrupts (Unix Power Tools)
    50.7. Protect Important Files: Make Them Unwritable (Unix Power Tools)
  -i option: 14.14. Using unlink to Remove a File with a Strange Name (Unix Power Tools)
    confirmation of deletions: 14.5. Answer "Yes" or "No" Forever with yes (Unix Power Tools)
    creating -i file for: 14.8. Safer File Deletion in Some Directories (Unix Power Tools)
  -r option: 14.16. Problems Deleting Directories (Unix Power Tools)
  excluding files from deletion: 14.18. Removing Every File but One (Unix Power Tools)
  filenames beginning with - (dash): 14.13. Handling a Filename Starting with a Dash (-) (Unix Power Tools)
  filenames beginning with . (dot): 14.16. Problems Deleting Directories (Unix Power Tools)
  linked files, deleting: 10.4.1. Differences Between Hard and Symbolic Links (Unix Power Tools)
  links, removing: 10.5. Creating and Removing Links (Unix Power Tools)
  rf option: 14.14. Using unlink to Remove a File with a Strange Name (Unix Power Tools)
  safety techniques for: 14.4. Tricks for Making rm Safer (Unix Power Tools)
rm command (Unix): 1.2.1. Problems Saving Files (Learning the vi Editor)
rm program: 4.4.5.1. rm (Learning Unix)
rmdel command (SCCS): 18.6. Alphabetical Summary of SCCS Commands (Unix in a Nutshell)
rmdir command: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  (see also mkdir command)
rmdir program: 4.4.5.2. rmdir (Learning Unix)
rmdir (remove directory) command: 14.16. Problems Deleting Directories (Unix Power Tools)
RMI (remote method invocation)
  compiler: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
rmic command: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
rmiregistry command: 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
rm/rmdir commands: 1.6.7. Working with Files and Directories (Mac OS X for Unix Geeks)
rmstar variable (tcsh shell): 14.4. Tricks for Making rm Safer (Unix Power Tools)
roffbib command: 17.4.3. Alphabetical Summary of Commands (Unix in a Nutshell)
root access
  enabling in Darwin: 49.12. Enabling Root in Darwin (Unix Power Tools)
  logins: 4.10. Highlighting and Color in Shell Prompts (Unix Power Tools)
  logins, external: 49.10. Never Log In as root (Unix Power Tools)
  password, forgetting: 49.3. Forgetting the root Password (Unix Power Tools)
  providing with sudo application: 49.11. Providing Superpowers with sudo (Unix Power Tools)
root directory: 3.1.3. The Directory Tree (Learning Unix)
  A.1. Files and Directories (Mac OS X for Unix Geeks)
  1.16. Making Pathnames (Unix Power Tools)
  subdirectories located directly off: 40.1. /usr/bin and Other Software Directories (Unix Power Tools)
root of a filename (:r string editing operator): 28.5. String Editing (Colon) Operators (Unix Power Tools)
root servers (DNS): 46.9. Domain Name Service (DNS) (Unix Power Tools)
root user: 1.6.1. Directories (Learning the Korn Shell)
  10.2.2. ulimit (Learning the Korn Shell)
  1.5.4. Additional Shell Commands (Mac OS X for Unix Geeks)
rootless mode, for XDarwin: 9.2. Running XDarwin (Mac OS X for Unix Geeks)
rot program: 21.21. Rotating Text (Unix Power Tools)
route command: 46.3. Status and Troubleshooting (Unix Power Tools)
routers
  DSL, firewalls: 46.12. Firewalls (Unix Power Tools)
  functioning as gateways: 46.11. Gateways and NAT (Unix Power Tools)
routing
  diagnosing routes with traceroute: 46.4. Where, Oh Where Did That Packet Go? (Unix Power Tools)
  packets, preventing with firewalls: 46.12. Firewalls (Unix Power Tools)
routing tables, displaying with netstart -r: 46.3. Status and Troubleshooting (Unix Power Tools)
RPM, finding and installing packaged software: 40.11. Finding and Installing RPM Packaged Software (Unix Power Tools)
RPN (Reverse Polish Notation): 8.5.4. Coroutines with Two-Way Pipes (Learning the Korn Shell)
  8.6.2. Subshells (Learning the Korn Shell)
rprnt key: 5.8. Setting Your Erase, Kill, and Interrupt Characters (Unix Power Tools)
-r/R options: 6.5.3. Type and Attribute Options (Learning the Korn Shell)
  6.5.3. Type and Attribute Options (Learning the Korn Shell)
  to print command: 7.2.1.2. Options to print (Learning the Korn Shell)
  to read command: 7.2.3.5. Options to read (Learning the Korn Shell)
RS variable: 7.7. System Variables (sed & awk)
  regular expression for: 11.2.1.6. Regular expression record separators (gawk and mawk) (sed & awk)
    11.3.2.1. Tawk language extensions
  (sed & awk)

rsh: 1.21. Unix Networking and Communications (Unix Power Tools)
  27.1. What the Shell Does (Unix Power Tools)
  disabling for security reasons: 48.11. Disallow rlogin and rsh (Unix Power Tools)
  display option: 6.10.2. Starting a Remote Client with rsh and ssh (Unix Power Tools)
  enabling on Mac OS X: 51.1. Enabling Remote Access on Mac OS X (Unix Power Tools)
  n option: 6.10.2. Starting a Remote Client with rsh and ssh (Unix Power Tools)
  remote tape drive, accessing with GNU tar: 38.8. Using GNU tar with a Remote Tape Drive (Unix Power Tools)
  restoring files from remote tape drives: 38.7. Using tar to a Remote Tape Drive (Unix Power Tools)
  rsync program: 20.6. Change Many Files by Editing Just One (Unix Power Tools)
  running reading- or writing-tar on remote system: 10.13. Copying Directory Trees with tar and Pipes (Unix Power Tools)
  starting remote X clients: 6.10.2. Starting a Remote Client with rsh and ssh (Unix Power Tools)
  stopping sessions: 23.13. Stopping Remote Login Sessions (Unix Power Tools)
rsh program: 6.1. Remote Logins (Learning Unix)
  6.1. Remote Logins (Learning Unix)
rsh (remote shell): 2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  2.1. Alphabetical Summary of Commands (Unix in a Nutshell)
  3.3. Shell Flavors (Unix in a Nutshell)
  4.8. Restricted Shells (Unix in a Nutshell)
rsync command: 20.6. Change Many Files by Editing Just One (Unix Power Tools)
  25.2. Periodic Program Execution: The cron Facility (Unix Power Tools)
RT variable (gawk): 11.2.3.5. Regular expression record terminators (sed & awk)
RUBOUT key: 1.1.8. Correcting a Command Line (Learning Unix)
ruler option: 8.6.7. Mode Indicators (Learning the vi Editor)
rules, pattern-matching (see pattern matching)
run-parts script: 25.2.2. A Little Help, etc. (Unix Power Tools)
runaway processes: 24.7.2. BSD (Unix Power Tools)
  killing by name: 24.15. Killing Processes by Name? (Unix Power Tools)
runaway processes, terminating with: 8.3.3.1. System V (Learning the Korn Shell)
runsed script: 34.4.2. runsed (Unix Power Tools)
ruptime command: B.2. Alphabetical Summary of Commands (Unix in a Nutshell)
rusers command: 35.25.2. Setting (and Parsing) Parameters (Unix Power Tools)
rwho command: B.2. Alphabetical Summary of Commands (Unix in a Nutshell)
  B.2. Alphabetical Summary of Commands (Unix in a Nutshell)
  (see also who command)
rxvt, replacement for xterm: 9.3. Desktops and Window Managers (Mac OS X for Unix Geeks)
rxvt terminal program: 5.9. Working with xterm and Friends (Unix Power Tools)
  fonts and command-line options: 5.18.1. VT Fonts Menu (Unix Power Tools)
  login shell, running: 5.10. Login xterms and rxvts (Unix Power Tools)

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